Android——AlertDialog及其子类 Android提供了功能丰富，应用广泛的对话框：AlertDialog。类图如下：

Android提供了功能丰富，应用广泛的对话框：AlertDialog。

类图如下：

AlertDialog

AlertDialog对话框分为三个区域：

1.标题区。包括图标和文本，setIcon()设置图标，setTitle()设置文本。

2.内容区。可以是简单的文本，也可以是复杂的View。AlertDialog提供了6个方法来设置不同的内容。

1)setMessage()，简单的文本。

2)setItems()，简单列表项。

3)setSingleChoiceItems()，单选列表项。

4)setMultiChoiceItems()，多选列表项。

5)setAdapter()，自定义列表项。

6)setView()，自定义View。

3.按钮区。可通过三个方法分别设置三个按钮，setPositiveButton()、setNegativeButton()或setNeutralButton()。

下面通过一个例子展示6种不同内容的AlertDialog。

Activity类：

[java]view plain copy
package com.zzj.ui.dialogdemo;  
  
import java.util.ArrayList;  
import java.util.List;  
  
import android.app.Activity;  
import android.app.AlertDialog;  
import android.content.DialogInterface;  
import android.content.DialogInterface.OnMultiChoiceClickListener;  
import android.os.Bundle;  
import android.view.LayoutInflater;  
import android.view.View;  
import android.widget.ArrayAdapter;  
import android.widget.EditText;  
import android.widget.Toast;  
  
import com.zzj.ui.R;  
  
public class DialogDemoActivity extends Activity {  
    private String singleChoice;  
    private List<String> multiChoices = new ArrayList<String>();  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
  
        setContentView(R.layout.dialogdemo_activity);  
    }  
  
    public void click(View v) {  
        AlertDialog.Builder builder = new AlertDialog.Builder(  
                DialogDemoActivity.this);  
        builder.setIcon(R.drawable.ic_launcher);  
  
        switch (v.getId()) {  
        case R.id.text_dialog:// 简单对话框  
            builder.setTitle("提示");  
            builder.setMessage("你想干什么？");  
            builder.setPositiveButton("保存",  
                    new DialogInterface.OnClickListener() {  
  
                        @Override  
                        public void onClick(DialogInterface dialog, int which) {  
                            Toast.makeText(DialogDemoActivity.this,  
                                    "你点击了 -- > " + which, Toast.LENGTH_LONG)  
                                    .show();  
                            return;  
                        }  
                    });  
            builder.setNegativeButton("删除",  
                    new DialogInterface.OnClickListener() {  
  
                        @Override  
                        public void onClick(DialogInterface dialog, int which) {  
                            Toast.makeText(DialogDemoActivity.this,  
                                    "你点击了 -- > " + which, Toast.LENGTH_LONG)  
                                    .show();  
                            return;  
                        }  
                    });  
            builder.setNeutralButton("取消",  
                    new DialogInterface.OnClickListener() {  
  
                        @Override  
                        public void onClick(DialogInterface dialog, int which) {  
                            Toast.makeText(DialogDemoActivity.this,  
                                    "你点击了 -- > " + which, Toast.LENGTH_LONG)  
                                    .show();  
                            return;  
                        }  
                    });  
            break;  
        case R.id.list_dialog:// 列表对话框  
            builder.setTitle("请选择省份");  
            final String[] items = new String[] { "湖南", "广东", "北京", "上海", "辽宁" };  
            builder.setItems(items, new DialogInterface.OnClickListener() {  
  
                @Override  
                public void onClick(DialogInterface dialog, int which) {  
                    Toast.makeText(DialogDemoActivity.this,  
                            "你选择了 -- > " + items[which], Toast.LENGTH_LONG)  
                            .show();  
                    return;  
                }  
            });  
            builder.setNegativeButton("取消",  
                    new DialogInterface.OnClickListener() {  
  
                        @Override  
                        public void onClick(DialogInterface dialog, int which) {  
                            return;  
                        }  
                    });  
            break;  
        case R.id.single_choice:// 单选对话框  
            singleChoice = null;  
            builder.setTitle("请选择省份");  
            final String[] singleItems = new String[] { "湖南", "广东", "北京", "上海",  
                    "辽宁" };  
            builder.setSingleChoiceItems(singleItems, 0,  
                    new DialogInterface.OnClickListener() {  
  
                        @Override  
                        public void onClick(DialogInterface dialog, int which) {  
                            singleChoice = singleItems[which];  
                            return;  
                        }  
                    });  
            singleChoice = singleItems[0];  
            builder.setPositiveButton("确定",  
                    new DialogInterface.OnClickListener() {  
  
                        @Override  
                        public void onClick(DialogInterface dialog, int which) {  
                            if (singleChoice != null) {  
                                Toast.makeText(DialogDemoActivity.this,  
                                        "你选择了 -- > " + singleChoice,  
                                        Toast.LENGTH_LONG).show();  
                            }  
                            return;  
                        }  
                    });  
            builder.setNegativeButton("取消",  
                    new DialogInterface.OnClickListener() {  
  
                        @Override  
                        public void onClick(DialogInterface dialog, int which) {  
                            singleChoice = null;  
                            return;  
                        }  
                    });  
            break;  
        case R.id.muti_choice:// 多选对话框  
            multiChoices.clear();  
            builder.setTitle("请选择省份");  
            final String[] multiItems = new String[] { "湖南", "广东", "北京", "上海",  
                    "辽宁" };  
            builder.setMultiChoiceItems(multiItems, new boolean[] { true,  
                    false, false, false, false },  
                    new OnMultiChoiceClickListener() {  
  
                        @Override  
                        public void onClick(DialogInterface dialog, int which,  
                                boolean isChecked) {  
                            if (isChecked) {  
                                multiChoices.add(multiItems[which]);  
                            } else {  
                                multiChoices.remove(multiItems[which]);  
                            }  
                            return;  
                        }  
                    });  
            multiChoices.add(multiItems[0]);  
            builder.setPositiveButton("确定",  
                    new DialogInterface.OnClickListener() {  
  
                        @Override  
                        public void onClick(DialogInterface dialog, int which) {  
                            if (!multiChoices.isEmpty()) {  
                                Toast.makeText(DialogDemoActivity.this,  
                                        "你选择了 -- > " + multiChoices,  
                                        Toast.LENGTH_LONG).show();  
                            }  
                            return;  
                        }  
                    });  
            builder.setNegativeButton("取消",  
                    new DialogInterface.OnClickListener() {  
  
                        @Override  
                        public void onClick(DialogInterface dialog, int which) {  
                            multiChoices.clear();  
                            return;  
                        }  
                    });  
            break;  
        case R.id.custom_item:// 自定义列表项对话框  
            builder.setTitle("请选择省份");  
            final String[] customItems = new String[] { "湖南", "广东", "北京", "上海",  
                    "辽宁" };  
            builder.setAdapter(new ArrayAdapter<String>(  
                    DialogDemoActivity.this,  
                    android.R.layout.simple_list_item_1, customItems),  
                    new DialogInterface.OnClickListener() {  
  
                        @Override  
                        public void onClick(DialogInterface dialog, int which) {  
                            Toast.makeText(DialogDemoActivity.this,  
                                    "你选择了 --> " + customItems[which],  
                                    Toast.LENGTH_LONG).show();  
                            return;  
                        }  
                    });  
            builder.setPositiveButton("取消",  
                    new DialogInterface.OnClickListener() {  
  
                        @Override  
                        public void onClick(DialogInterface dialog, int which) {  
                            return;  
                        }  
                    });  
            break;  
        case R.id.custom_view: // 自定义View对话框  
            builder.setTitle("登录");  
            LayoutInflater inflater = LayoutInflater  
                    .from(DialogDemoActivity.this);  
            final View view = inflater.inflate(R.layout.dialog_custom_view,  
                    null);  
            builder.setView(view);  
            builder.setPositiveButton("登录",  
                    new DialogInterface.OnClickListener() {  
  
                        @Override  
                        public void onClick(DialogInterface dialog, int which) {  
                            String username = ((EditText) view  
                                    .findViewById(R.id.edit_username))  
                                    .getText().toString();  
                            String password = ((EditText) view  
                                    .findViewById(R.id.edit_password))  
                                    .getText().toString();  
                            if ("001".equals(username)  
                                    && "123".equals(password)) {  
                                Toast.makeText(DialogDemoActivity.this,  
                                        "登录成功！", Toast.LENGTH_LONG).show();  
                            } else {  
                                Toast.makeText(DialogDemoActivity.this,  
                                        "用户名或密码错误！", Toast.LENGTH_LONG).show();  
                            }  
                            return;  
                        }  
                    });  
            builder.setNegativeButton("取消",  
                    new DialogInterface.OnClickListener() {  
  
                        @Override  
                        public void onClick(DialogInterface dialog, int which) {  
                            return;  
                        }  
                    });  
            break;  
        default:  
            break;  
        }  
  
        // builder.show();  
        builder.create().show();  
    }  
}  

布局文件：

[html]view plain copy
<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    android:orientation="vertical" >  
  
    <Button  
        android:id="@+id/text_dialog"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:onClick="click"  
        android:text="简单文本对话框" />  
  
    <Button  
        android:id="@+id/list_dialog"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:onClick="click"  
        android:text="列表对话框" />  
  
    <Button  
        android:id="@+id/single_choice"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:onClick="click"  
        android:text="单选列表框" />  
  
    <Button  
        android:id="@+id/muti_choice"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:onClick="click"  
        android:text="多选列表框" />  
  
    <Button  
        android:id="@+id/custom_item"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:onClick="click"  
        android:text="自定义列表项对话框" />  
  
    <Button  
        android:id="@+id/custom_view"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:onClick="click"  
        android:text="自定义View对话框" />  
  
</LinearLayout>  

自定义View布局文件dialog_custom_view.xml：

[html]view plain copy
<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    android:orientation="vertical" >  
  
    <EditText  
        android:id="@+id/edit_username"  
        android:layout_width="match_parent"  
        android:layout_height="wrap_content"  
        android:inputType="text"  
        android:hint="请输入用户名"  
        android:ems="10" >  
    </EditText>  
  
    <EditText  
        android:id="@+id/edit_password"  
        android:layout_width="match_parent"  
        android:layout_height="wrap_content"  
        android:inputType="textPassword"  
        android:hint="请输入密码"  
        android:ems="10" />  
  
</LinearLayout>  

Android——AlertDialog及其子类 Android提供了功能丰富，应用广泛的对话框：AlertDialog。 类图如下：

Android提供了功能丰富，应用广泛的对话框：AlertDialog。

类图如下：

AlertDialog

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Android——AlertDialog及其子类 Android提供了功能丰富，应用广泛的对话框：AlertDialog。类图如下：